CN110707780B - Staggered battery equalization circuit structure based on transformer - Google Patents
Staggered battery equalization circuit structure based on transformer Download PDFInfo
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- CN110707780B CN110707780B CN201911037506.9A CN201911037506A CN110707780B CN 110707780 B CN110707780 B CN 110707780B CN 201911037506 A CN201911037506 A CN 201911037506A CN 110707780 B CN110707780 B CN 110707780B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0019—Circuits for equalisation of charge between batteries using switched or multiplexed charge circuits
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/18—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
- B60L58/22—Balancing the charge of battery modules
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Abstract
The invention provides a transformer-based staggered battery equalization circuit structure, which comprises a controller and a plurality of battery pack equalization units cascaded into a loop, wherein each battery pack equalization unit is arranged according to an Nth-level battery pack equalization unit; the Nth-stage battery pack balancing unit comprises a first MOS (metal oxide semiconductor) tube, a multi-winding transformer with a primary winding coil and a plurality of secondary winding coils and a plurality of battery cell balancing modules; the controller outputs a first PWM signal to the first MOS tube and simultaneously outputs a second PWM signal to the second MOS tube of each single battery balancing module in the same battery pack balancing unit, so that the first MOS tube and the second MOS tubes of all the single battery balancing modules in the same battery pack balancing unit work alternately, and automatic transmission between energy battery packs and between single batteries is realized. By implementing the invention, not only can the energy balance of all the battery monomers in the battery pack be realized, but also the energy balance among different battery packs can be realized.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a transformer-based staggered battery equalization circuit structure.
Background
Under the multiple pressures of reduction of non-renewable resources, serious environmental pollution, aggravation of greenhouse effect and the like, the development and utilization of new energy resources are imminent. The large-scale development of electric automobiles is an important way for the development and utilization of new energy, and is highly valued by all countries in the world. Lithium ion batteries are the mainstream form of energy sources of current electric vehicles due to the excellent characteristics of high monomer voltage, high energy density, high energy discharge rate, small self-discharge rate, long cycle life, no memory effect, large-current charge and discharge and the like.
The power battery pack of the automobile is usually used by a plurality of single batteries which are connected in series and in parallel, but the inconsistency problem of the batteries is caused by different internal resistances of the batteries, different capacities of the batteries, aging of the batteries, environmental temperature change and the like, and the inconsistency problem brings harm to the performance, the service life and the safety of the battery pack. In order to improve the inconsistency of the battery pack, a reasonably effective equalization control of the cells is required.
The equalization method can be classified into an energy consumption type equalization method and a non-energy consumption type equalization method according to whether there is energy loss in an ideal equalization process. The energy consumption balancing method is characterized in that resistors are connected in parallel to each single battery to perform discharge balancing, but the energy consumption is high, the balancing speed is low, the efficiency is low, and the heat dissipation is large. The non-energy-consumption type balancing method is characterized in that energy is transferred from one single battery to another single battery by using a proper energy storage element and an energy transfer circuit, and the method is small in energy consumption, high in balancing speed and high in efficiency. For example, the patent application No. 201710981394.7 is an invention patent named as a battery equalization circuit based on forward and flyback conversion and an implementation method thereof, and the invention patent can realize the simultaneous equalization of any battery cell to any battery cell in a battery pack, but the control circuit of the circuit is complex and cannot realize the energy equalization among the battery packs. For another example, patent application No. 201510902586.5 entitled battery equalization circuit based on multiphase interleaved converter and control method thereof is disclosed, which realizes equalization of any battery cell to any battery cell, but the circuit structure is complex, and energy equalization between battery packs cannot be realized.
However, there is a need for a staggered battery balancing circuit structure that can not only achieve energy balancing of all the battery cells in the battery pack, but also achieve energy balancing between different battery packs.
Disclosure of Invention
The technical problem to be solved by the embodiments of the present invention is to provide a transformer-based interleaved battery equalization circuit structure, which not only can achieve energy equalization of all battery cells in a battery pack, but also can achieve energy equalization between different battery packs, thereby improving equalization efficiency and speed, and effectively improving inconsistency between battery cells.
In order to solve the above technical problem, an embodiment of the present invention provides a transformer-based interleaved battery equalization circuit structure, including a controller and a plurality of battery equalization units cascaded to form a loop, where each battery equalization unit is configured according to an nth-level battery equalization unit and performs energy equalization with the battery equalization unit cascaded thereto; the N-stage battery pack balancing unit comprises a first MOS (metal oxide semiconductor) tube, a multi-winding transformer with a primary winding coil and a plurality of secondary winding coils and a plurality of battery monomer balancing modules, wherein N is a positive integer; wherein, the first and the second end of the pipe are connected with each other,
the grid electrode of the first MOS tube is connected with the controller, the source electrode of the first MOS tube is connected with one end of a primary winding coil of a multi-winding transformer in the battery pack balancing unit, and the drain electrode of the first MOS tube is connected with the anode of a battery pack formed by all battery monomers in a plurality of battery monomer balancing modules in the battery pack balancing unit at the upper stage in series;
the other end of the primary winding coil of the multi-winding transformer is connected with the negative electrode of a battery pack formed by all battery monomers in a plurality of battery monomer balancing modules in the upper-stage battery pack balancing unit in series;
the battery single equalizing modules comprise battery single bodies and second MOS tubes; the battery pack comprises a plurality of battery cell balancing modules, a plurality of first MOS tubes, a plurality of second MOS tubes, a plurality of first MOS tubes and a plurality of second MOS tubes, wherein all battery cells in the plurality of battery cell balancing modules are sequentially connected in series to form a battery pack, the anode of the battery pack formed by the series connection is connected with the drain electrode of the first MOS tube in the next-stage battery pack balancing unit, and the cathode of the battery pack formed by the series connection is connected with one end, far away from the first MOS tube, of a primary winding coil of a multi-winding transformer in the next-stage battery pack balancing unit; the positive electrode of each battery cell in the plurality of battery cell balancing modules is connected with the source electrode of a second MOS tube in the battery cell balancing module, and the negative electrode of each battery cell is connected with one end of a corresponding secondary winding coil on the multi-winding transformer; the grid electrode of each second MOS tube in the battery single equalization modules is connected with the controller, and the drain electrode of each second MOS tube is connected with the other end of a secondary winding coil of a multi-winding transformer connected with a battery single in the battery single equalization modules;
the controller outputs a first PWM signal to the first MOS tube and simultaneously outputs a second PWM signal to the second MOS tube of each single battery balancing module in the balancing unit of the same battery pack, so that the second MOS tubes of all the single battery balancing modules in the balancing unit of the same battery pack and the corresponding first MOS tubes work alternately; wherein potentials of the first PWM signal and the second PWM signal at the same time are set to be different.
The number of the first MOS tubes in the Nth-stage battery pack balancing unit is two, and the two first MOS tubes are respectively connected with two ends of a primary winding coil of the multi-winding transformer; wherein the content of the first and second substances,
the grid electrode of a first MOS tube is connected with the controller, the source electrode of the first MOS tube is connected with one end of a primary winding coil of a multi-winding transformer in the battery pack balancing unit, and the drain electrode of the first MOS tube is connected with the anode of a battery pack formed by all battery monomers in a plurality of battery monomer balancing modules in the battery pack balancing unit at the upper stage in series;
the grid electrode of the other first MOS tube is connected with the controller, the source electrode of the other first MOS tube is connected with the negative electrode of the battery pack formed by all the battery monomers in the plurality of battery monomer balancing modules in the battery pack balancing unit at the upper stage in series, and the drain electrode of the other first MOS tube is connected with the other end of the primary winding coil of the multi-winding transformer in the battery pack balancing unit.
Each single battery balancing module in the Nth-stage battery pack balancing unit comprises two second MOS tubes, and the two second MOS tubes are respectively connected with the positive electrode and the negative electrode of the corresponding single battery; wherein the content of the first and second substances,
the grid electrode of the second MOS tube is connected with the controller, the source electrode of the second MOS tube is connected with the positive electrode of the single battery in the single battery equalization module, and the drain electrode of the second MOS tube is connected with one end of a secondary winding coil of the multi-winding transformer connected with the single battery in the single battery equalization module;
and the grid electrode of the other second MOS tube is connected with the controller, the source electrode of the other second MOS tube is connected with the cathode of the battery monomer in the battery monomer balancing module, and the drain electrode of the other second MOS tube is connected with the other end of the secondary winding coil of the multi-winding transformer connected with the battery monomer in the battery monomer balancing module.
The embodiment of the invention has the following beneficial effects:
1. the invention can realize the simultaneous equalization of all the battery monomers in the battery pack and the simultaneous equalization among different battery packs, thereby greatly improving the equalization efficiency and the equalization speed;
2. the invention does not need a secondary equalization circuit, reduces the circuit volume and reduces the use cost;
3. the invention only needs a pair of complementary PWM signals to control the equalizing circuit to work in two states alternatively, thus having simple control and high reliability;
4. the battery pack balancing unit is easy to modularize, balancing among the battery modules can be realized only by connecting the battery pack and the multi-winding transformer in a staggered mode, the balancing circuit can work in the charging, discharging or static state of the battery pack, and the battery pack balancing unit is suitable for rechargeable power batteries of lithium ions, nickel hydrogen, lead-acid and the like without changing the circuit structure.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is within the scope of the present invention for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a single-stage battery equalization unit in a transformer-based interleaved battery equalization circuit structure according to an embodiment of the present invention;
fig. 2 is another schematic structural diagram of a single-stage battery pack balancing unit in a transformer-based interleaved battery balancing circuit structure according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a two-stage battery pack balancing unit in a transformer-based interleaved battery balancing circuit structure in a working state I for performing energy balancing according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a two-stage battery pack balancing unit in a transformer-based interleaved battery balancing circuit structure in a working state II for performing energy balancing according to an embodiment of the present invention;
fig. 5 is a graph of test results of the voltage of the initial cell according to the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
In an embodiment of the present invention, the transformer-based interleaved battery equalization circuit structure includes a controller and a plurality of battery equalization units cascaded to form a loop, and each battery equalization unit is configured according to an nth-level battery equalization unit and performs energy equalization with the battery equalization unit cascaded thereto. For convenience of description, the nth-stage battery pack balancing unit will be described in detail.
As shown in fig. 1, the nth-stage battery pack balancing unit includes a first MOS transistor 1, a multi-winding transformer 2 having a primary winding coil 21 and a plurality of secondary winding coils 22, and a plurality of cell balancing modules 3, where N is a positive integer; wherein the content of the first and second substances,
a grid G of the first MOS tube 1 is connected with the controller 4, a source S is connected with one end of a primary winding coil 21 of a multi-winding transformer 2 in a battery pack balancing unit, and a drain D is connected with a positive pole (+) of a battery pack formed by all battery monomers 31 in a plurality of battery monomer balancing modules 3 in a previous-stage battery pack balancing unit (N-1) in series;
the other end of the primary winding coil 21 of the multi-winding transformer 2 is connected with the negative pole (-) of the battery pack formed by connecting all the battery monomers 31 in the battery monomer balancing modules 3 in the previous-stage battery pack balancing unit (N-1) in series;
each of the plurality of cell balancing modules 3 includes a cell 31 and a second MOS transistor 32; all the battery monomers 31 in the battery monomer balancing modules 3 are sequentially connected in series to form a battery pack, the positive pole (+) of the battery pack formed by the series connection is connected with the drain D of the first MOS tube 1 in the next-stage battery pack balancing unit (N +1), and the negative pole (-) of the battery pack formed by the series connection is connected with one end, far away from the first MOS tube 1, of the primary winding coil 21 of the multi-winding transformer 2 in the next-stage battery pack balancing unit (N + 1); the positive pole (+) of each battery cell 31 in the plurality of battery cell balancing modules 3 is connected with the source electrode S of the second MOS transistor 32 in the battery cell balancing module, and the negative pole (-) of each battery cell is connected with one end of a corresponding secondary winding coil 22 on the multi-winding transformer 2; the grid G of each second MOS tube 32 in the plurality of cell balancing modules 3 is connected with the controller 4, and the drain D is connected with the other end of the secondary winding coil 22 of the multi-winding transformer 2 connected with the cell 31 in the cell balancing module;
the controller 4 outputs a first PWM signal to the first MOS transistor 1, and simultaneously outputs a second PWM signal to the second MOS transistor 32 of each cell balancing module 3 in the balancing unit of the same battery pack, so that the second MOS transistors 32 of all the cell balancing modules 3 in the balancing unit of the same battery pack and the corresponding first MOS transistors 1 work alternately; the first PWM signal and the second PWM signal are set to be different in potential at the same moment.
It should be noted that, since a plurality of battery pack balancing units are cascaded to form a loop, the battery pack balancing unit at the previous stage of the head battery pack balancing unit is the tail battery pack balancing unit, and the battery pack balancing unit at the next stage of the tail battery pack balancing unit is the head battery pack balancing unit.
It can be understood that, since the first PWM signal and the second PWM signal output by the controller 4 are complementary PWM signals in a pair of states, that is, PWM + and PWM-, the second MOS transistor 32 of each cell balancing module 3 in the same battery pack balancing unit is enabled, and the second MOS transistors 32 of all the cell balancing modules 3 in the same battery pack balancing unit are enabled to be alternately conducted with the corresponding first MOS transistor 1, there are two working states: state I and state II;
and a state I: the first MOS tube corresponding to the primary winding coil of the multi-winding transformer of the Nth-level battery pack balancing unit is conducted, so that the energy of the Nth-level battery pack balancing unit is transferred to the primary winding coil of the multi-winding transformer of the (N +1) th-level battery pack balancing unit;
and state II: and the second MOS tube corresponding to the secondary winding coil of the multi-winding transformer of the Nth-stage battery pack balancing unit is conducted, so that all the battery monomers in the Nth-stage battery pack balancing unit obtain energy from the primary winding coil of the multi-winding transformer in the Nth-stage battery pack balancing unit.
The two complementary states are continuously alternated, so that the direct automatic transfer of energy between the battery pack balancing units with any voltage from higher to lower and between the battery cells with any voltage from higher to lower is realized, the energy balance of all the battery cells in the battery pack can be realized, the energy balance among different battery packs can be realized, the balancing efficiency and speed are improved, and the inconsistency among the battery cells is effectively improved.
In the embodiment of the present invention, as shown in fig. 2, there are two first MOS transistors 1 in the nth stage battery pack balancing unit, and the two first MOS transistors 1 are respectively connected to two ends of the primary winding coil 21 of the multi-winding transformer 2; wherein the content of the first and second substances,
a grid G of a first MOS tube 1 is connected with a controller 4, a source S is connected with one end of a primary winding coil 21 of a multi-winding transformer 2 in a battery pack balancing unit, and a drain D is connected with a positive pole (+) of a battery pack formed by all battery monomers 31 in a plurality of battery monomer balancing modules 3 in a previous-stage battery pack balancing unit (N-1) in series;
the grid G of the other first MOS tube 1 is connected with the controller 4, the source S is connected with the cathode (-) of the battery pack formed by all the battery monomers 31 in the battery monomer equalizing modules 3 in the previous-stage battery pack equalizing unit (N-1) in series, and the drain D is connected with the other end of the primary winding coil 21 of the multi-winding transformer 2 in the battery pack equalizing unit.
In the embodiment of the present invention, as shown in fig. 2, each cell balancing module 3 in the nth-stage battery pack balancing unit includes two second MOS transistors 32, and the two second MOS transistors 32 are respectively connected to the positive electrode and the negative electrode of the corresponding cell 31; wherein the content of the first and second substances,
a grid G of a second MOS tube 32 is connected with the controller 4, a source S is connected with a positive pole (+) of a battery monomer 31 in the battery monomer equalizing module, and drains D are connected with one end of a secondary winding coil 22 of the multi-winding transformer 2 connected with the battery monomer 31 in the battery monomer equalizing module;
the grid G of the other second MOS tube 32 is connected with the controller 4, the source S is connected with the cathode (-) of the battery cell 31 in the battery cell balancing module, and the drain D is connected with the other end of the secondary winding coil 22 of the multi-winding transformer 2 connected with the battery cell 31 in the battery cell balancing module.
As shown in fig. 3 and fig. 4, an application scenario of the transformer-based interleaved battery equalization circuit structure in the embodiment of the present invention is further described:
the staggered battery equalization circuit structure is provided with two cascaded battery pack equalization units, and each battery pack equalization unit comprises 4 battery monomers, 1 multi-winding transformer, 2 first MOS (metal oxide semiconductor) tubes and 8 second MOS tubes; wherein, 1 battery monomer and 2 second MOS pipes form a battery monomer balanced module, 4 battery monomer balanced modules in total.
And 4 battery monomers of 4 battery monomer equalizing modules in the battery pack equalizing unit form a battery pack, and the total number of the battery packs is 2. Each battery pack is respectively connected with a primary winding coil of a multi-winding transformer in the adjacent cascaded battery pack balancing unit by using a first MOS tube in the adjacent cascaded battery pack balancing unit, and each battery monomer in each battery pack is respectively connected with a secondary winding coil corresponding to the multi-winding transformer in the same battery pack balancing unit by using a second MOS tube in the same battery monomer balancing module, so that a staggered battery balancing circuit is formed.
In fig. 3, a schematic diagram of the operating state I of two cascaded battery equalization units is shown. The controller generates PWM + signals to enable the first MOS tubes corresponding to the primary winding coils of the multi-winding transformers in the two cascaded battery pack balancing units to be conducted, so that the energy of the battery pack in the battery pack balancing unit on the left side is transferred to the primary winding coils of the multi-winding transformers in the battery pack balancing unit on the right side.
Fig. 4 is a schematic diagram of the operating state II of two battery equalization units connected in cascade. The controller generates PWM-signals to enable the corresponding second MOS tubes of the multi-winding transformers in the two cascaded battery pack balancing units to be conducted, so that the battery monomer corresponding to the battery pack in the battery pack balancing unit on the left side obtains energy from the primary winding coil of the multi-winding transformer in the same battery pack balancing unit.
Similarly, the energy of the battery pack in the right battery pack balancing unit is transferred to the primary winding coil of the multi-winding transformer in the left battery pack balancing unit, and the battery cell corresponding to the battery pack in the right battery pack balancing unit obtains the energy from the primary winding coil of the multi-winding transformer in the same battery pack balancing unit. The two complementary states are continuously alternated, and direct automatic transfer of energy from any battery cell with higher voltage to any battery cell with lower voltage is realized.
At this time, the initial Cell voltages are Cell11 ═ 3.621, Cell12 ═ 3.827, Cell13 ═ 3.376, Cell14 ═ 3.451, Cell21 ═ 3.622, Cell22 ═ 3.719, Cell23 ═ 3.532, and Cell24 ═ 3.306, respectively. After the equalization is completed, the voltages of all the battery cells simultaneously converge to around 3.533, and the maximum difference between the voltages is 0.001. As shown in fig. 5, the experimental result shows that the equalizing circuit of the present invention can obtain the simultaneous equalization of any battery cell to any battery cell, and has the advantages of high equalizing speed and high equalizing efficiency.
The embodiment of the invention has the following beneficial effects:
1. the invention not only can realize the simultaneous equalization of all the battery monomers in the battery pack, but also can realize the simultaneous equalization among different battery packs, thereby greatly improving the equalization efficiency and the equalization speed;
2. the invention does not need a secondary equalization circuit, reduces the circuit volume and reduces the use cost;
3. the invention only needs a pair of complementary PWM signals to control the equalizing circuit to work in two states alternatively, thus having simple control and high reliability;
4. the battery pack balancing unit is easy to modularize, balancing among the battery modules can be realized only by connecting the battery pack and the multi-winding transformer in a staggered mode, the balancing circuit can work in the charging, discharging or static state of the battery pack, and the battery pack balancing unit is suitable for rechargeable power batteries of lithium ions, nickel hydrogen, lead-acid and the like without changing the circuit structure.
It will be understood by those skilled in the art that all or part of the steps in the method for implementing the above embodiments may be implemented by relevant hardware instructed by a program, and the program may be stored in a computer-readable storage medium, such as ROM/RAM, magnetic disk, optical disk, etc.
While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (3)
1. A transformer-based staggered battery equalization circuit structure is characterized by comprising a controller and a plurality of battery pack equalization units cascaded into a loop, wherein each battery pack equalization unit is arranged according to an Nth-level battery pack equalization unit and performs energy equalization with the battery pack equalization units cascaded with the battery pack equalization unit; the N-stage battery pack balancing unit comprises a first MOS (metal oxide semiconductor) tube, a multi-winding transformer with a primary winding coil and a plurality of secondary winding coils and a plurality of battery monomer balancing modules, wherein N is a positive integer; wherein, the first and the second end of the pipe are connected with each other,
the grid electrode of the first MOS tube is connected with the controller, the source electrode of the first MOS tube is connected with one end of a primary winding coil of a multi-winding transformer in the battery pack balancing unit, and the drain electrode of the first MOS tube is connected with the anode of a battery pack formed by all battery monomers in a plurality of battery monomer balancing modules in the upper-stage battery pack balancing unit in a serial connection mode;
the other end of the primary winding coil of the multi-winding transformer is connected with the negative electrode of a battery pack formed by all battery monomers in a plurality of battery monomer balancing modules in the upper-stage battery pack balancing unit in series;
the battery single equalizing modules comprise battery single bodies and second MOS tubes; the battery pack comprises a plurality of battery cell balancing modules, a plurality of first MOS tubes, a plurality of second MOS tubes, a plurality of first MOS tubes and a plurality of second MOS tubes, wherein all battery cells in the plurality of battery cell balancing modules are sequentially connected in series to form a battery pack, the anode of the battery pack formed by the series connection is connected with the drain electrode of the first MOS tube in the next-stage battery pack balancing unit, and the cathode of the battery pack formed by the series connection is connected with one end, far away from the first MOS tube, of a primary winding coil of a multi-winding transformer in the next-stage battery pack balancing unit; the positive electrode of each battery cell in the plurality of battery cell balancing modules is connected with the source electrode of a second MOS tube in the battery cell balancing module, and the negative electrode of each battery cell is connected with one end of a corresponding secondary winding coil on the multi-winding transformer; the grid electrode of each second MOS tube in the battery single equalization modules is connected with the controller, and the drain electrode of each second MOS tube is connected with the other end of a secondary winding coil of a multi-winding transformer connected with a battery single in the battery single equalization modules;
the controller outputs a first PWM signal to the first MOS tube and simultaneously outputs a second PWM signal to a second MOS tube of each single battery balancing module in the same battery pack balancing unit, so that the second MOS tubes of all single battery balancing modules in the same battery pack balancing unit and the corresponding first MOS tubes work alternately; wherein potentials of the first PWM signal and the second PWM signal at the same time are set to be different.
2. The transformer-based interleaved battery equalization circuit architecture of claim 1 wherein there are two first MOS transistors in said nth stage battery equalization unit, and said two first MOS transistors are connected to two ends of the primary winding coil of said multi-winding transformer, respectively; wherein the content of the first and second substances,
the grid electrode of a first MOS tube is connected with the controller, the source electrode of the first MOS tube is connected with one end of a primary winding coil of a multi-winding transformer in the battery pack balancing unit, and the drain electrode of the first MOS tube is connected with the anode of a battery pack formed by all battery monomers in a plurality of battery monomer balancing modules in the battery pack balancing unit at the upper stage in series;
the grid electrode of the other first MOS tube is connected with the controller, the source electrode of the other first MOS tube is connected with the negative electrode of the battery pack formed by all the battery monomers in the plurality of battery monomer balancing modules in the battery pack balancing unit at the upper stage in series, and the drain electrode of the other first MOS tube is connected with the other end of the primary winding coil of the multi-winding transformer in the battery pack balancing unit.
3. The transformer-based interleaved battery equalization circuit architecture of claim 2 wherein each cell equalization module in said nth stage battery equalization unit comprises two second MOS transistors, and said two second MOS transistors are connected to the positive and negative electrodes of their corresponding cells, respectively; wherein, the first and the second end of the pipe are connected with each other,
the grid electrode of the second MOS tube is connected with the controller, the source electrode of the second MOS tube is connected with the positive electrode of the single battery in the single battery equalization module, and the drain electrode of the second MOS tube is connected with one end of a secondary winding coil of the multi-winding transformer connected with the single battery in the single battery equalization module;
and the grid electrode of the other second MOS tube is connected with the controller, the source electrode of the other second MOS tube is connected with the cathode of the battery monomer in the battery monomer balancing module, and the drain electrode of the other second MOS tube is connected with the other end of the secondary winding coil of the multi-winding transformer connected with the battery monomer in the battery monomer balancing module.
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Application publication date: 20200117 Assignee: Tianjin Aikong Technology Co.,Ltd. Assignor: Wenzhou University Contract record no.: X2023330000260 Denomination of invention: A Transformer Based Interlaced Battery Equalization Circuit Structure Granted publication date: 20220823 License type: Common License Record date: 20230424 |